Question regarding Granite Stains from Installatio

I spent a lot of time installing Granite countertops
over the old counter in my kitchen (havign sanded the
prior counter for adhesion). I then layed a layer of
mud, attached the tile, and though all was well. Abotu
an hour or two into the process, the granite started
showing odd staining patterns, which I presumed was
moisture from the mud coming through the porous stone.
However, the stains are not leaving (6 days later).
They are in odd spots, odd shapes, based (preumably)
on the thickness of the mud below. Should I use a
poultice to remove? What material for poultice -
hydrogen peroxide/acetone? Thanks for any help you can
provide.



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